... ,welding,forging,annealing and melting Intermediate frequency induction chain wheel hardening machineInduction hardening equipment:frequency about 40KHZ,smaller can ... shaft which diameter within 250, also can hardeningGear wheel diameter within about 500 and 800.1. hardening ... hardening machinery parts, such as: all kinds of gear wheel, chain wheel, kinds of axis, pin.3. hardening the industrial of ...